<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div class="calculation">
    <div class="num"><input type=" text"></div>
    <div class="button">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    <input type="button" value="">
    </div>
</div>
</body>
</html>